Sub-Categories

In our August Newsletter, we asked "Why portholes are traditionally
round?"

A:
They were round to accommodate cannons, and the design stuck
B: Round portholes are less likely to suffer from stress cracks
C: Corners tend to accumulate water and develop leaks
D: Round portholes are quicker and easier to clean

Thanks for playing the quiz. Though all answers are probably correct to some
degree, the true answer is B.

The constant up-and-down motion of a ship puts considerable stress on the ship's
skin. If portholes were designed with angles, this stress would tend to concentrate
at those points and perhaps crack the skin. With round portholes such stress
is evenly distributed around the holes, making it less likely for such cracks
to occur. Of course, these days such problems are much less common, so portholes
are now available in a wide variety of shapes and sizes!